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Sensors 2013, 13(4), 4146-4156; doi:10.3390/s130404146

A Two-Dimensional Laser Scanning Mirror Using Motion-Decoupling Electromagnetic Actuators

1
Department of Mechanical Engineering, Sogang University, 1 Shinsu-dong, Mapo-gu, Seoul 121-742, Korea
2
Department of Mechanical Engineering, Chungnam National University, 99 Deahangno, Yuseong-gu, Daejeon 305-764, Korea
*
Author to whom correspondence should be addressed.
Received: 21 January 2013 / Revised: 28 January 2013 / Accepted: 18 March 2013 / Published: 27 March 2013
(This article belongs to the Special Issue Laser Sensing and Imaging)
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Abstract

This work proposes a two-dimensional (2-D) laser scanning mirror with a novel actuating structure composed of one magnet and two coils. The mirror-actuating device generates decoupled scanning motions about two orthogonal axes by combining two electromagnetic actuators of the conventional moving-coil and the moving-magnet types. We implement a finite element analysis to calculate magnetic flux in the electromagnetic system and experiments using a prototype with the overall size of 22 mm (W) × 20 mm (D) × 15 mm (H) for the mirror size of 8 mm × 8 mm. The upper moving-coil type actuator to rotate only the mirror part has the optical reflection angle of 15.7° at 10 Hz, 90° at the resonance frequency of 60 Hz at ±3 V (±70 mA) and the bandwidth of 91 Hz. The lower moving-magnet type actuator has the optical reflection angle of 16.20° at 10 Hz and 50° at the resonance frequency of 60 Hz at ±5 V (±34 mA) and the bandwidth of 88 Hz. The proposed compact and simple 2-D scanning mirror has advantages of large 2-D angular deflections, wide frequency bandwidth and low manufacturing cost. View Full-Text
Keywords: laser scanning mirror; electromagnetic actuator; optical scanning; two-dimensional scanner laser scanning mirror; electromagnetic actuator; optical scanning; two-dimensional scanner
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Shin, B.H.; Oh, D.; Lee, S.-Y. A Two-Dimensional Laser Scanning Mirror Using Motion-Decoupling Electromagnetic Actuators. Sensors 2013, 13, 4146-4156.

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